"It was a little bit of a shell shock to see him doing that well, " Mr. Goodman says.

WSJ: New Strategies to Revive Victims of Cardiac Arrest

Monica Wilson, associate director of employer relations at Dartmouth College, believes that passivity may be a symptom of shell shock.

ECONOMIST: Where will business students find work?

After suffering shell shock in 1917, he was sent to recover at Craiglockhart Hospital, where he met fellow poet Siegfried Sassoon.

BBC: Wilfred Owen's birthplace given listed status

After the first world war he was involved in research into shell shock, which he later likened to the condition of certain industrial workers.

ECONOMIST: Guru

"They range from the usual 'It's my favourite book, ' and 'I love Darcy, ' to 'This book has saved me at times of great trial, ' she says, adding: "Austen was even prescribed to soldiers in World War I, to help them get over shell shock.

CNN: STORY HIGHLIGHTS

Crabs that had been shocked but had remained in their shell appeared to remember the experience of the shock because they quickly moved towards the new shell, investigated it briefly and were more likely to change to the new shell compared to those that had not been shocked.

CNN: Crabs 'feel and remember pain' suggests new study